The document discusses drink driving and car accidents. It defines drink driving as operating a vehicle with a blood alcohol concentration over the legal limit, which varies by jurisdiction. It notes that while most drivers who drink have low blood alcohol levels and are not in fatal crashes, a small number of drivers with very high levels are disproportionately represented in fatal accidents. It also states that there are no simple solutions to preventing drink driving and that it requires a multifaceted approach like most social problems.